Circle rule



V E. P. MANLY.

CIRCLE RULE.

APPLICATION HLED MAR-129, 1921- 1,4() 2,629, Patented Jan. 3,1922.

*1: I nRnEsip iefMAN Y, F ews aemgv emm;

' 'To'aZZ it m MW 1 t )citizen*ofthe United l'Stzttes,"residing etfPorts lnouth'; inftheje'ounty of Norfolk end State of Virginia; have.invented certaln new m and u s'efnlT Impro ements in; Circle" Rule;

I do herebyfdec1a1fe the following to be F full, clear, andexact"desoriptionjjoithe invention, such will enable *others'f skilled Iand usethe seme.

} yTheiinvention providee'in single article e v Corresponding a fp'arereferred ,meens'; for drawing straight j lines e'nydeti'minatedength 101' outlinin diameter Within the range 0% the device.1 Y

The invention 1 de elatively adjustable points.

" parent and, suggest themselves lasthejneture Theinvention consists ofa banthevingione or both edges straightifol dijreoting etylns';Whendrawing streightlinesyseid'baro having j L 1 a longitudinal slot andbeing grednatedfon} z' s use as w'ruleiinlaying oflf Work. The :bafis as'a centering element. f Afslidelisx edju st-d able Lon thefbar and is -adaptedto carry a, pencil for outliningkoiroles ;means-being pro- 1' 6,videdfor -securingtheslidein the j requl red,

provided at one end Withal point to bejiused Other objects andedyantegesW111 be ap- 7' of the invention is understood;

- 'Whfl e the drawings illustrate enqerhbodi-a "I'nentof the inyentionflitis tofbe understood the-thin adapting the gamete meet difierentconditions and requirements,various'changes in the' form; proportionand' minoi' ydetails? of oonstructionqmey be resorted .to withontdeparting from the nature of the invention "Referring to ftheaccompanying]drawing forming a p i f t e peoificatlon w f Figure 'l iisetop pl anivi ew of a cireleg rulei 11 1'1st1'z'n;ive oflthejnventiong 1being brokenaway, y

Figure-3 I18 at cros ssection ion thefline i oiFigureL and:

'F'gnre 4c is a [detail perspective of the slide.

- to in the followi g desriptioniand g" noted in thes'eiieralgviewsofthe 1 by-like referenoe:charaoters.

The article comprises a bar Whichrnay be of anyleng h and cross seqt llnel out in o SPeifie t'iQEof LettersiPatent egean n1 Marni {29,15213115 11 1 16.45 562 Figure/fins an edge viewwthe eof;

drawings v 'radijusfof the eirc1etobesoribed 'I'lhe' serib ing ofithecircle iSyeffeeted by swinging the y g; I balyl about'theipoint k-es aoentefw1thh Qiipo it 'j e fild iedge dffthe ba I "1 I are' 'streight toenable the; wi e, tob l ised (as 21L rule-whenjdrgtwing straight-iineSL' i A slot 21extends longitudinally ofthebnrljto; Within 'ashort}distance of i the ends thereof. n The glongitildinahelot2 provideselearance;

for iape'ncil orletylus 3L pointi tds fp i'o g Y yidedzitoneiendofthehaif flanldjfconsltitutee v T 1 a oentering element; (The ,b'ani s"proyide'd, -i in it length! with graduation? 5 preferably.) inchesandyfrao ctionali para -enema to facilitate;the;'layingfoff fgwo'ikjan d*1e Jtermining easurements;

erebly tapers 'thfonghont?its'flengthQ being T b f 'lfP e -fl v widestettheend pfoizidedwith he Point 1: Y A re'oess 6l ifs;formedfinthenpperfside" U ofathe'vbep 1 inTl inefwiththflongitndinal 1 Vslot-"2enditsfoppoeitelongitndinal wallsfzi re 'nnderout topreventdisplacementof the slide 7 h v KOrEpenciI oarriei' 71disposedgin thereoesfig:

The recess 6 extends longitudinally of? the l jsi nd -is fedeptedto bedoedat one {end ,byvm s o P 8; wh y reyi n i I had for' placin the:Slide 0p penoilfozirrietyf 7'in pos iti0nn heplatefifisvpi eventedfromdisplecem ent by means of the point which -1 extends- .thel ethrlo'ugh.The slide/0r pencil Q o earrier'T preferably consists ofablockwhich igpointed: and Icoopei'etes with the soele gredn htofretain' theslidefiaingthadjusted position";

f devi je const fieted' in gecbidanee with the presentlnventlon sadapted fonuse a rule, a; gage'or compass forscnbmgclroles.' I M Thelongitudinal edges of "-the ban 1 are adaptedto givefdirection toagpencih: pen or other stylus when drawing straight lines.

Fors oi'ib ing a, oirele, thebar l is held atone @endbymeans of thepoint, the slide LYiheing} adjusted t0 bring'the peno'i1 b r1 sty1ue3edis-} 1 l tencepfrom-theopointl correspondingto the i dlsposedrecessclosed; at one end, amarker point ofithe pencil 3 or lilze 'deiiice''incon- Itact Withthe surface uponwhich'the circle ;-is to be scribed.For usefas a gageflhe slide -7 'be adjusted to vary t he' distance between the point 4- and the .point'of the pencil according tethe distanceto belmeasuied be:

I lsweelrl relatively "adjustabl points of'a g What is claimed i Y i 1;An instrument "of the class 'd'escliihed consisting of a bai haying a'"longitudinally carriage movable saidfrecess, a closure member 01dispositionf ihisaid recess at; the

, said recess to} facilitate movement of the marker,a closure member;for disposition in olihe -jend v to prevent longitudinal. displacementof said carriage therefrom, an'da point serving,as compass centen -foirihe bar,

securing said closure member 2. ;A n instrilmeilfi of the classdescribed consisting-pf; a bar having a longitudinally disposed recess,marker carriagegmovable in said recess, said bar liaviilg a slot. belowsaid recess to pieventdisplacemexit of said seryifig as; a "pointeg-abinding. memloer [mo inted the other end of tliecros s piece 1 andengageable against the bar-,said' plate having a marker-insert openingthere through, said icross piece being cutaway oversaidopening, andapoint member serv- :ing as a; compass center for the bar securing saidclosure member to thebar; V instrument ofvthe class described consistingofabar having a longitudinally 7 disposed recess, a marker carriermovable in sald ITGC BSS SELICl bar having a slotbelow sald recess tofacllitate movement ,ofythe marker,a closuremember foii disposition.iIisaid 'ecess to preventl displacement ofsaid carriage therethi ough,s'a1d carriage having a jdoveta1led plate, sa drrecess confoimlng mshapeoo saidcarriagdial cross-piece on said p1atesoi erlapping ,the harf'o i iopposit' sides of said recess, [oneendjofffsaid crossi-Ipie'cemounted in tli'e other, ehdOf the cross-piece and eilgageable against.the bar, and said' plate havlng a marker insert iopemngihere- ;through.a V r a lntestimQ y whereof l'afixy's e Presence ftwo witnesses.

ERN

serving' as .a' pointer,;;aibinding member

